Some partners are facing the issue that their monetization has randomly been disabled. Follow George's tutorial on how to resolve this issue:
- Go to http://youtube.com/advanced_settings (creator studio -> channel -> advanced)
- Scroll down to "Advertisements"
- Tick "Allow advertisements to be displayed alongside my videos"
- Scroll to the bottom of the page to click on "Save"
Go to http://youtube.com/features (creator studio -> channel -> status and features) to see if your monetization is enabled again (it would say: Monetization: You can use ads to monetize your videos).
You are done! You have successfully (re-)enabled monetization on your channel.
NOTE: This tutorial does NOT solve disabled monetization/AdSense accounts by YouTube. In order to appeal your AdSense ban, please refer to this FAQ by YouTube.